Echofon

Echofon is a twitter client for windows with nice interface.
Use all of your Twitter accounts in Echofon, account switching is easy and you’ll see a subtle notification for mentions and messages you recieve in background accounts.

Unread tweets stay in sync with your iPhone. If you read tweets on your mac, and later open up Echofon on your iPhone, you can pick up right where you left off. Never again will you read the same tweet twice!